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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f82d22ef8053a94d241e23e459eadcc0b330a7677fa3ac716064ed544d673ef5' 
  AND token = 'Ep8N2xfzqqc3bnzm3IvuQg33VbET6Kfw5EwZYuhylIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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