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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06bef0cac99910b05ef44f0b0415055e42c095292e3f7bd8671c1775afd8d709' 
  AND token = 'JYvfK7s70qawAxf8XkT0JLauBYbx9lohyQYUynKsD1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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