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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5551338104a12ebb0a9c1b369209b83b3ef16a2e7178fbdf77a2622ae70d13f6' 
  AND token = 'ILWY2GohoBX8z3VeD4DDK1FkUhKBpNVRQikiEIfU71M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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