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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30f74c2f360423fcdd10e37c701cf8aa3ef039972644e24f4422ee51e3c0304e' 
  AND token = '0i1Y1ZP9awVUECXRTJqyvdBsca+6js+nEEpb4HaunPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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