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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26f3c9526ea08b0bbb8298c0be26872892fd2c90333f4e234f6602c7062b0ced' 
  AND token = 'F0RfvKtrL6XH9SnRPqtHAS2K3ykKMvjp3BUBC2hmrb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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