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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b9a232bccc042598c3a38c6541b380b73cf51dde887e5a5dfeac4f203ba1db7' 
  AND token = 'IPMmmIKo2SmWQlA8U2csPQujuPdlRYkugbdtOVyzxIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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