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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c14a88ceb42a72aa5f94c8955e5b34109007be975a026ce5de40af871b1fcccd' 
  AND token = 'INtWfYtBKQsnoHGpC9EoMN702vdYcGFWKHW32srtm0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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