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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad27c940972a330c221f2aa3a13ba97e30c931949e1d9c197088374f262d2a57' 
  AND token = 'K5Wz4WpIxPHONR/dMAx40yfp+DULRCWzg6y5/lHjNTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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