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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c48007268bff0d4ce04bc43c1a61075877dd31f4410fd5947d6cfd667e556f03' 
  AND token = 'uxsU7NcmXDvUo3NzAt75ua2iapQJK/gRPuJvHtK5ytM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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