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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cfb622c77c8f30769f3a3c6526cfcf101b55765aa1bebac779f77de7b4499cb' 
  AND token = 'kGAKphFoQPFY39irpkx3s1ouY+X332+clddB42GaLgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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