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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d278151dab94c77a9468db7343f860669d0148556d3c46c68ba3bc2ff2b83b2' 
  AND token = '9hQ5gnDEAA3DeFlDodY8bfl/CdGxX3r/VP3hx0+c4kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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