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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75eef3950a0d3e6abb30d41cfc40f88d95e2abcfd301284e6580711868a9b6e2' 
  AND token = 'sfr9lMV7AJeBFQ2BDQB8ZiTZfVnHktXIpOqADqcrmOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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