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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b10fb6eb8fc9b89f3a82ca9b4addd398d5cfd6e5dc9bf9932c2f4aa1ce08536' 
  AND token = 'mw4sOhe7kTELhlI6nIBkeG80Sw0ImfN7NnI8W1Vl2x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}