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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce1e221b816926af1e3fca55835ba4af138916a3f05c1a11c1422c603d1ed55c' 
  AND token = '0MCbtx/78SWHUsrYWemuM56GtwL+gqG0tueOj15L7qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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