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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ac3c7a32e57179c81769f9bc1d1da7979cff2952b95f27b46f8b2aa042d134a' 
  AND token = 'zzcqBptDNaHj+t22Gr7ZXHxSTOMq3NEqyEEhA68VSyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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