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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dc716ff4ccaf6bf6d8e0a2c97111fb2307b118dcdd196ba29b522cf5feec70b' 
  AND token = 'qHruckzWSSucFOPVmaMb8Fyppl2x8601qA+f2yILSGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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