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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc2495f2383286f56861938ab33c106f842ad8d3f09410038e683e6e2505b53f' 
  AND token = '7DmOzX9G4kI0lZ277ABVyVPq7Ee6NjbMpNvzEiNIqcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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